Open AccessFPGA implementation of closed‐loop compensation for LFMCW signal non‐linear distortions
Author(s) -
Qian Rong,
Jiang Defu,
Fu Wei
Publication year - 2019
Publication title -
iet signal processing
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.384
H-Index - 42
eISSN - 1751-9683
pISSN - 1751-9675
DOI - 10.1049/iet-spr.2018.5298
Subject(s) - polyphase system , field programmable gate array , computer science , compensation (psychology) , amplifier , electronic engineering , signal (programming language) , digital signal processing , signal processing , radar , computer hardware , bandwidth (computing) , telecommunications , engineering , psychology , psychoanalysis , programming language
Linear‐frequency‐modulated continuous‐wave (LFMCW) radars with deramping technique have several advantages such as compact size, low cost, and easy implementation, compared to traditional pulse radars; however, the non‐linear distortions caused by analogue modules, particularly power amplifiers, may deteriorate the radar detection performance. To solve this problem, a digital closed‐loop compensation scheme for the LFMCW signal is proposed, which can compensate the LFMCW signal in real time, when the non‐linear distortions change with the working environment. The proposed compensation scheme improves the detection performance, noticeably. Considering the speed limitations of field programmable gate arrays (FPGAs), the proposed scheme is implemented in an FPGA at an intermediate‐frequency level, using a polyphase processing structure.